If you need to support these browsers, you must add a polyfill like Ryan Seddon's H5F.
Add validation to your forms with this simple plugin.Also, the attribute can be added to form controls, to programmatically indicate that they are required.Most current web browsers support this attribute and will communicate missing required input to the user, using standard web browser dialog mechanisms."But aren't there already a ton of validation plugins out there?" Right, there are a lot of non-j Query-based solutions (which you'd avoid since you found j Query) and some j Query-based solutions.So we can use an ordinary button instead.) The source for this function, and main focus of this page, I place here: Note the flag is initially set to true.
The reason is we will only be checking certain conditions on the form -- and if those conditions pass, then the rest of the form's inputs are assumed valid (otherwise we'd validate them in the function! The first statement checks to see if the line1.value is NOT "Java Script".
In some situations, such as validating custom controls or supporting legacy browsers, additional scripting may be necessary to validate user input.
Custom validation needs to notify users in an accessible way as described in the User Notifications part of this tutorial.
In addition to providing instructions, validate user input to help users avoid mistakes.
HTML5 defines a range of built-in functionality to validate common types of input, such as email addresses and dates.
For example, you'd be surprised at what kinds of email addresses are considered valid according to standards.